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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i1.20
14 pages

VISUALIZATION OF THE EFFECT OF DISPERSED PARTICLES ON HEAT TRANSFER FROM AN IMPINGING JET

Julien Reveillon
CORIA UMR 6614, University of Rouen, Technopole du Madrillet, BP 12, 76801 Saint-Etienne-du-Rouvray Cedex, France
K. Canneviere
University of Rouen, UMR CNRS 6614 CORIA, Avenue de l’Universite - BP 8, FR-76801 Saint Etienne du Rouvray Cedex, France

ABSTRACT

The objective of this paper is to show the effect of a solid (or nonvaporizing) dipersed phase on the turbulent structures of an impinging jet. Direct numerical simulation (DNS) has been carried out to fully describe the turbulence evolution from the jet destabilization up to the breakup of the structures. A Lagrangian solver has been coupled to the DNS code to describe precisely the interactions between the particles and the gas. Two kinds of particles have been considered: (1) incident particles that are embedded in the jet at the injection level. These particles modify strongly the turbulence characteristics and increase heat transfer from the jet; (2) when incident particles are impacting on the wall, very small ejecta (particles of carbon) may be emitted and, in this case, heat fluxes decrease because of strong turbulent mixing close to the wall. Creation of small swirling structures as well as core of recirculation close to the wall could be detected thanks to numerical visualization of nonstationary flows.